That's the many consonants following each other and the rather short vowels. You'll get used to it. But especially people whose native language is quite melodic tend to have problems there.
I am half joking. It does sound much more harsh then English, but it’s still understandable. the poorly phrased joke was the Roman and Greek tradition of calling Germanic languages barbarian
This was from a schematic that I recall seeing a few years ago, detailing the general layout of a German U-Boat. At some point in WW2, the RCN had captured a few of them intact and pressed them into service, and they determined at the time that it was apparently easier to just teach the submariner crews how to read German rather than translate everything onboard to English.